Finding the Fourth Proportional to 57,870.72, 79,945.92 and 39,090.24

Step by Step Solution

1. Step 1: Write the proportion equation
   57,870.72 : 79,945.92 = 39,090.24 : x
2. Step 2: Convert to fraction form
   57,870.72/79,945.92 = 39,090.24/x
3. Step 3: Cross multiply
   57,870.72x = 79,945.92 × 39,090.24
4. Step 4: Simplify right side
   57,870.72x = 3,125,105,199.82
5. Step 5: Solve for x
   x = 3,125,105,199.82/57,870.72
6. Step 6: Final answer
   x = 54,001.49